A chair was ripped out and thrown at Aberdeen fans during their match against Rangers.

Police have launched an investigation into the incident, as well as other incidents of vandalism and disorder, after a video emerged online.

Two supporters have also been charged in connection with offences at the match at Pittodrie on Sunday.

A 25-year-old man from Aberdeen was charged in relation to an offence involving possession of a pyrotechnic, while 22-year-old male from Glasgow over offensive behaviour at the stadium.

Officers have launched a a further investigation after the Rangers team bus was vandalised in the early hours of Sunday morning before the match, which finished 2-1 to the home side.

Graffiti referring to the 1971 Ibrox disaster was scratched into the bus outside the Ardoe Hotel before the league match, which finished 2-1 to the home side.

A video posted on YouTube from the match shows a yellow chair being thrown over a fence in the stands splitting up the rival supporters. An Aberdeen fan is struck on the head by the chair.

A spokeswoman for Police Scotland confirmed inquiries are ongoing into the incident.

An Aberdeen FC spokesman said: "Unfortunately this is an all too often occurrence. Damage incurred by away fans is billed back to the club."

Rangers released a statement following the match condemning the vandalism to the team bus and police have also launched a probe into the incident.

A spokesman for Rangers said: "The club is disgusted and disappointed by this act of vandalism. In particular, the reference to the Ibrox disaster in which 66 people lost their lives is especially vile.

"This sort of behaviour has no place in civilised society. The incident was immediately reported to Police Scotland and we will assist them with their inquiries."

Chief superintendent Thomson said: "As anticipated the vast majority of fans who attended Pittodrie on Sunday acted in a safe and responsible manner which assisted officers in ensuring the safety of those in attendance and the wider public. I would like to take this opportunity to thank them for their support.

"In saying this, and despite repeated warnings from Police Scotland in the lead-up to match, I am extremely disappointed that a very small minority of fans chose to conduct themselves in an anti-social and completely unacceptable way. I understand that feelings run high at these events, however such behaviour is inexcusable. It also creates significant security issues which put your own safety and the safety of others at risk.

"For those who have committed offences and were not detected at the time I can assure you that you will face the consequences of your actions. Retrospective enquiries are being carried out and we have a dedicated team working in partnership with both clubs to identify those people in the stadium and outwith who let not only themselves down but their clubs too.

"I would appeal to anyone with any information about any of the incidents in question that could help with our inquiries to contact Police on 101 or Crimestoppers if you would prefer to remain anonymous on 0800 555111."